Keep in mind the original Winchester 1886 in 45-90 had a different twist then the same rifles in 45-70. The 45-70s could use bullets up to 500 grains. The 45-90 was limited to 300 grain bullets in the era they were made. I don't know how the newest Miroku rifles are twisted, but in 1986 when Browning re-introduced the M1886 they were chambered in the 45-70 but twisted slower like the 45-90s were which is why they shot 300 grain bullets very well, 350s OK and 400 poorly as a rule. 500 grain bullet would impact sideways at 25 yards I has 2 of them and they were definitely "light bullet rifles"
I have been told that Winchester addressed that problem (After the joining with Browning) and the the new Winchester 1886s are twisted 1-18 instead of 1-30, but I have not proven that to myself yet, so take it as hear-say for now,.
Last edited by szihn; 05/23/21.
